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Transcript
RF cell Anders Sunesson RF group leader (assistance from the RF group kindly acknowledged) www.europeanspallationsource.se RF cell review, May 11, 2017 RF systems • Power to 155 cavities, one RF station/cavity ‒ High Voltage new development: SML modulator topology ‒ High Power RF Amplifier new development: MB-IOT amplifier (targeted for high beta) • A large part of the RF systems is provided in collaboration with partners • • • • • • RF NC linac (Spain) (complete RF systems) Spoke RF stations (Italy) (RF transmitters + interlocks) LLRF (Spain and Poland) (both NC and SC) RF high power distribution (UK) (SC linac) Phase ref distribution (Poland) (the whole linac) Installation (Poland) • Collaboration Lund Univ Uppsala Univ(FREIA facility) 2 RF Cell Interlock Basic building block for RF systems is the RF cell: • High Voltage • Amplifiers • Regulation (LLRF) • Protection – Interlock • Waveguides Design status • Detailed electrical diagrams (E-plan) – TS2 95% done as a trial • • • • • Cable procurement Connector procurement Cable schedules Installation optimisation Working with cable database (WP16) Cable Database Preparation 155 Systems Approx. 120 external cables per system 18000 WP8 cables 55 unique devices per system – Currently being extended to MB – Sample sent to ESS Bilbao for RFQ, DTL and MEBT – Based on schematics but now with full pin-to-pin connectivity • • • • All devices named All cables and pin-to-pin specified All connectors defined Etc – Rack layout complete and power requirements documented Electrical schematics at system level 4 Design status • Selection of Top Requirements – MPS functionality agreed (WP8 – ICS) – PSS functionality agreed (WP8 – ICS) – Water parameters (temperature, flow, pressure, pressure drop, filtration and quality etc) agreed (WP8 – WP15) – Electrical parameters (rack power and HV agreed) (WP8 – WP16) • UPS decision still somewhat unclear – Modulator electrical interfaces and requirements agreed (WP8 – WP17) – Water instrumentation requirements agreed (WP8-WP16) – Gallery and tunnel environment agreed (WP8 – Building) – Rack space and location agreed (WP8 – WP15) 5 Design status • Selection of Top Requirements – Interface to cryomodules agreed (size, location and orientation) (WP8 – EMR) – RF power to beam agreed (WP8-WP3) – Cavity field stability (via LLRF) agreed (WP8-WP3) – Phase reference outputs, connectors, power levels agreed (WP8-WP3, WP8-WP7) – MO performance agreed (WP8-WP3, WP8-WP7) – Local Protection System • Only intended to protect RF CELL except • Selection of fast cavity interlocks included 6 Design status • Selection of Top Requirements – Quench Detector (was orphan item) (WP8-EMR) • Requirement not fully defined, however fast digital concept proposed and detailed design being started – Electron Pick (was orphan item) (WP8-EMR) • Requirement agreed, first design complete and prototyping under way – Safety and Installation • WSCPs under production • RA and MS documentation under production • Activities being coordinated with Area Manager – QA/QC • • • • TA include relevant references QA/QC invited to PDRs and CDRs QA/QC invited to comment on procurement specifications prior to tender CE marking where possible and applicable 7 RF cell medium beta 8 High Voltage • • • • • Needed to power RF amplifiers Voltages to >100 kV Currents 20-80 A Pulsed or cw Large and $$$ 9 Development strategy ESS • • • • • • Prototyping 330 kVA, 1 contract Internal development: SML topology Validated and used for RFQ/DTL/MB, 660 kVA Provided in-kind for RFQ/DTL by ESS Bilbao (3 pcs) Provided by ESS for Medium beta (9 pcs) Spoke – RF integrated transmitter, provided in-kind by Elettra • High beta: start prototype work during 2018 for IOT modulator, discussing possible in-kind • Interfaces with High power amplifiers, controls, interlock 10 High power amplifiers Amplifiers: • Generate High power RF • Power up to several MW • Typical example klystron • Large, $$$ 11 Amplifiers • Solid state amplifiers • Tube amplifiers • Interfaces with LLRF, HV modulator, controls, cooling systems 12 High power amplifiers ESS linac Section Power /kW Baseline design Strategy Status Normal conducting RFQ and DTL 2800 Klystron Exist commercially In kind: recondition + buy Normal conducting bunchers 30 Solid State Tender from market In kind: ready for tender Spoke linac 400 Tetrode Tender from market In kind: design and tender Medium beta linac 1500 Klystron 3 prototypes, tender 2 suppl Tender awarded Finance development 2 prototypes Prototypes under test High beta linac 1500/1200 MB-IOT Klystron/IOT (decision end 2017) 13 RF distribution system Transport RF to cavity: • Waveguides • Circulator (protect amp) • Load (reflected power) • Couplers for measurements • Arc detectors for protection 14 RF distribution system • Layout in gallery, stub, tunnel very critical • Coexist with shielding and cables in stubs • Coexist with cooling piping, cable trays, RF equipment in gallery • Coexist with cable trays, cavities, cryo lines, piping in tunnel • Interfaces with RF amplifiers, cavities, interlock, LLRF, cooling systems, controls Phase reference, Master Oscillator Phase reference: • What is the right phase? • LLRF regulates to that • Given by phase ref • All along the linac 16 Interlock Protection: • Amplifier • Waveguides • Cavity • LLRF • Fast (μs) and slow (ms) 17 Interlock • Handles protection of the RF cell • Strategic decision to have interlock handle ALL protection functions • This leads to splitting of RF signals between LLRF and interlock • LLRF handles NO protection functions • Interfaces with control systems • Interfaces with MPS, PSS • Provided in-kind from MTA Atomki, Debrecen • Interfaces with all RF cell systems that have an interlock 18 LLRF LLRF regulates cavity amplitude and field: • PI-control • Adaptive feedforward • Inner klystron loop • Beam current variation compensation 19 LLRF • Design based on STRUCK-hardware (DESY) • MTCA 4 standard • ESS manages algorithms – Challenge regulation limits • Provided in-kind from – ESS Bilbao for RFQ/MEBT/DTL/Spoke – Polish Electronic Group for medium/high beta • Interfaces to phase reference line, amplifiers, cavity, controls, distribution system 20 Installation • Installation manpower provided in-kind from IFJ PAN Krakow for most RF systems • Installation starts summer/autumn 2017 (phase ref) • Requires very precise planning and great flexibility • Installation plan v 3 for ACCSYS is being drafted 21